Private Valuation & Funding Round Tracker · Helion

Helion funding rounds & valuation history

Name: Helion Funding Rounds & Valuation History
Creator: growthnavigatefunding.net

Helion (Helion Energy), the Everett, Washington fusion-power company building a plant for Microsoft, from its 2021 Series E to the 2026 Series G at $15.5B, sourced to Helion’s own releases, TechCrunch and GeekWire.

Last updated: 13 Nov 2026 (IST). Every figure re-checked against the linked sources that day. Rows: 3 Currency: US$, nominal

⬇ Download CSV Cite this dataset Methodology & status definitions

Last closed round Closed

$15.5B

$500M Series G, 4 Jun 2026 (Helion)

Up-step, Series G

2.86×

$15.5B vs $5.425B (GNF calc.)

Total raised

About $1.5B

Total invested to date, per Helion (Jun 2026)

Latest signal Closed

$15.5B

Post-money, Series G, Jun 2026 (Helion)

Round history

Newest first. Dashed badges and striped rows are not closed transactions. “—” means the source does not disclose the figure or it cannot be computed on the same basis; see the note in each row.

Helion funding rounds, November 2021 to June 2026
Date	Status	Round	Amount	Lead / buyer	Valuation	Val. ÷ run-rate	Source
4 Jun 2026	Closed round	Series GHelion: the oversubscribed round closed at $500M in September 2026, up from the $465M first close, and was capped. Helion: total invested to date $1.5B.	$500M$465M at first close (4 Jun); $500M at final close (Sep 2026)	Thrive CapitalWith: Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, Bill Ford (new); existing investors	$15.5BPost-money, stated by Helion (“values the company at $15.5 billion post-money”)2.86× vs prior closed	—Not disclosedNo run-rate stated in the announcement	Helion, 4 Jun 2026 (updated Sep 2026)Also: TechCrunch, 4 Jun 2026, GeekWire, Sep 2026
28 Jan 2025	Closed round	Series FTechCrunch printed $5.245B; the page uses Helion’s own figure. Helion: total invested over $1B after this round.	$425M	Not named; participants include Sam Altman, Mithril Capital, Capricorn Investment Group, Dustin Moskovitz (Good Ventures Foundation), Nucor and SoftBank Vision Fund 2	$5.425BPost-money, stated by Helion (“values the company at $5.425 billion post-money”)1.81× vs prior closed	—Not disclosedNo run-rate stated in the announcement	Helion, 28 Jan 2025Also: TechCrunch, 28 Jan 2025
5 Nov 2021	Closed round	Series EGeekWire: Altman contributed $375M. The $1.7B milestone commitments are not counted in the amount.	$500MPlus up to $1.7B more tied to milestones (Helion)	Sam AltmanWith: Dustin Moskovitz, Mithril Capital, Capricorn Investment Group	$3BReported by Axios, via GeekWire (“valued at $3 billion”); not stated by Helion	—Not disclosedNo run-rate stated in the announcement	Helion, 5 Nov 2021Also: GeekWire, Nov 2021

Step-up = valuation ÷ the prior closed valuation (GNF calc.). Talks, tenders and rounds without a stated valuation carry no step-up.

Valuation at each closed round

Closed rounds with a stated or reported valuation. Talks, tenders and rounds without a valuation are in the table, not the chart.

Series ENov 2021$3B
Series FJan 2025$5.425B
Series GJun 2026$15.5B

Sources: Helion; TechCrunch; GeekWire. US$ billions, linear scale.

Timeline

Each round and share sale, oldest first.

5 Nov 2021 · Closed
Series E: $500M at $3B, led by Sam Altman.
28 Jan 2025 · Closed
Series F: $425M at $5.425B.
4 Jun 2026 · Closed
Series G: $500M at $15.5B, led by Thrive Capital.

Still private: Helion has not filed for an IPO and is not owned by a listed company. In October 2026 it signed a letter of intent for up to $175M of CHIPS R&D funding from the U.S. Department of Commerce, to be accompanied by $50M of additional private investment; on a definitive award, Commerce would receive a $175M non-voting interest priced off the Series G preferred valuation (Helion). That is a pending government award, not a funding round, so it is not a row.

Cite this dataset

Free to quote with a link back. Copy this citation:

Helion Funding Rounds & Valuation History. Private Valuation & Funding Round Tracker, GrowthNavigateFunding.net, updated 13 Nov 2026. https://growthnavigatefunding.net/funding/helion-energy/

Download the data

The same 3 rows as the table: numeric US$ columns, empty cells where a figure is not disclosed, and a source URL for every row.

File: helion-energy-rounds.csv (UTF-8, comma-separated)
Stable URL: https://growthnavigatefunding.net/wp-content/uploads/2026/11/helion-energy-rounds.csv
Columns: id, date, date_precision, status, transaction_type, round, amount_usd_low, amount_usd_high, lead_or_buyer, co_leads, valuation_usd_low, valuation_usd_high, valuation_basis, valuation_to_run_rate_multiple, multiple_bound, multiple_basis, step_up_vs_prior_closed, price_per_share_usd_low, price_per_share_usd_high, shares, source, source_url, other_source_urls, notes, last_updated
Updated: 13 Nov 2026 (IST)

⬇ Download CSV

Methodology & status definitions

How each row is labelled and calculated.

Closed round

A primary round announced by the company or confirmed in the press, bringing new money to the company.

Valuation ÷ run-rate

Post-money valuation ÷ the run-rate the company stated in that announcement (GNF calc.). Where the run-rate is “crossed” or “over” a figure, the multiple is shown as “under X×”. No row qualifies here unless shown, so no multiple is invented.

What is not a separate row

Rounds before 2021, the $1.7B of milestone-based commitments attached to the Series E, government awards, and secondary-market estimates.

Updates & corrections

This page stays at one address and is updated in place; the “Last updated” date above drives the citation and the dataset metadata. Corrections: hello@growthnavigatefunding.net. Informational only; not investment advice.

Changelog

13 Nov 2026: Dataset first compiled (batch 3, not yet published).

Helion Funding Rounds & Valuation History (2021–2026)